材料期刊网

<正> 为深入了解12CrMo钢的循环塑性变形规律,本文在已有工作的基础上进一步研究循环加载所形成的疲劳位错结构特征。 研究用料为12CrMo钢,其主要元素含量为0.10％C,0.53％Cr和0.48％Mo。热轧圆钢锻成板状毛坯后,于930℃加热,进行退火处理,获得等轴状合金铁素体和少量珠光体的显微组织。应用Amsler型高频疲劳试验机进行循环拉伸试验。加载频率为180Hz。试样在疲劳极限(167MPa)的循环应力作用下,经10~7周的循环加载后,

The fatigue dislocation structure in an alloy ferrite steel was studied by the method of electron diffraction contrast analysis. The dislocation structure features in annealed 12CrMo steel variate after 10~7 cycles under cyclic tensile stresses. The main features of fatigue dislocation structure are dislocation jog, dipole, Ioop, deformation band, tangle and banded dislocation structure. Alloy ferrite grains are broken into blocky-like microstructure regions.